372 



^Iv. Vonlton' a ftirtJter (wpcrinicnts upon 



light produce the same effect. This test was appHed in 

 the same year as follows : — 



Experiments 2 and 2a. 



A compaii}' of 29 mature larvas (probahly the last 

 remaining ones) was found 1 p.m., July 80. By 3.30 it 

 became evident that the shock had caused 16 of them to 

 cease feeding, and enter Stage I. These were placed in 

 two receptacles, a box lined with gilt, and a cylinder lined 

 ■with black paper, with the open end closed by a sheet of 

 clear glass, and turned to a strong east light. Others 

 were subsequently added as they entered Stage I. 



No notes were taken as to tlie colours of the pupa3, but 

 it may be safely assumed that those in black were far 

 darker than the others ; and it is also clear that, although 

 the larvte were treated in exactly the same way (except 

 as regards their surroundings), those in black pupated 

 rather later than the others. Although all were sus- 

 pended by 4.50 p.m. on July 31 in both sets, all but one 

 had been suspended more than 2 hours earlier in the 

 gilt, a time at which only two-thirds of those in the black 

 had entered Stage 111. Tliese are less satisfactory than 

 Experiments 1 and 1 a, in the fact that probably all the 

 larva; were disturbed by capture, but they undoubtedly 

 support the conclusions previously arrived at. 



